9. Cooling Water System
9.1 Water quality
The fresh water in the cooling water system of the engine must fulfil the following requirements:
min. 6.5...8.5pH ...............................
max. 10 °dHHardness .....................
max. 80 mg/lChlorides .....................
max. 150 mg/lSulphates ....................
Good quality tap water can be used, but shore water is not always suitable. It is recommended
to use water produced by an onboard evaporator. Fresh water produced by reverse osmosis
plants often has higher chloride content than permitted. Rain water is unsuitable as cooling
water due to the high content of oxygen and carbon dioxide.
Only treated fresh water containing approved corrosion inhibitors may be circulated through
the engines. It is important that water of acceptable quality and approved corrosion inhibitors
are used directly when the system is filled after completed installation.
9.1.1 Corrosion inhibitors
The use of an approved cooling water additive is mandatory. An updated list of approved
products is supplied for every installation and it can also be found in the Instruction manual
of the engine, together with dosage and further instructions.
9.1.2 Glycol
Use of glycol in the cooling water is not recommended unless it is absolutely necessary. Glycol
raises the charge air temperature, which may require de-rating of the engine depending on
gas properties and glycol content. Max. 60% glycol is permitted.
Corrosion inhibitors shall be used regardless of glycol in the cooling water.
DBAE248994 9-1
9. Cooling Water SystemWärtsilä 31DF Product Guide
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